Exporting symbols between modules

Exporting symbols between modules

[Sergio Paracuellos]

Hi all,

I'm new in this list and I have some problems exporting symbols in a
module to see them in other module.

In the module I want to export the symbol I do:

tList list;
EXPORT_SYMBOL(list);

I compile it and install without any problem.

And in the module I want to use them I declare list with "extern"
prototype:

extern tList list;

When I compile the module It says me that list is undefined, and I don't
know what I am doing wrong.

Does anybody know what is happening? 

Maybe a makefile example would be appreciated... 

Thanks in advance.

Regards,

	Sergio 

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Re: Exporting symbols between modules

[simon guinot]

hello

On Wed, 24 Aug 2005 09:28:08 +0200
Sergio Paracuellos <sparacuellos@lock-linux.com> wrote:

> Hi all,
> 
> I'm new in this list and I have some problems exporting symbols in a
> module to see them in other module.
> 
> In the module I want to export the symbol I do:
> 
> tList list;
> EXPORT_SYMBOL(list);

ok... you've better to use the EXPORT_SYMBOL_NOVERS macro to export the symbol whiteout the versioning information...
don't forget to define EXPORT_SYMTAB before include module.h...
you can add a -DEXPORT_SYMTAB in your Makefile or a #define EXPORT_SYMTAB before 
#include <linux/module.h> in your source file...

> 
> I compile it and install without any problem.
> 
> And in the module I want to use them I declare list with "extern"
> prototype:
> 
> extern tList list;
> 
> When I compile the module It says me that list is undefined, and I don't
> know what I am doing wrong.

a compilation error or a loading error ?
are you sure to have well defined the type tList in your "client" module ?
may be a shareed header between your modules is missing :) 

regards

simon
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Re: Exporting symbols between modules

[Sergio Paracuellos]

El mié, 24-08-2005 a las 16:59 +0200, simon guinot escribió:
> hello
> 
> On Wed, 24 Aug 2005 09:28:08 +0200
> Sergio Paracuellos <sparacuellos@lock-linux.com> wrote:
> 
> > Hi all,
> > 
> > I'm new in this list and I have some problems exporting symbols in a
> > module to see them in other module.
> > 
> > In the module I want to export the symbol I do:
> > 
> > tList list;
> > EXPORT_SYMBOL(list);
> 
> ok... you've better to use the EXPORT_SYMBOL_NOVERS macro to export the symbol whiteout the versioning information...
> don't forget to define EXPORT_SYMTAB before include module.h...
> you can add a -DEXPORT_SYMTAB in your Makefile or a #define EXPORT_SYMTAB before 
> #include <linux/module.h> in your source file...

Thanks, I solve it because it was a Makefile problem.

I was trying to compile two modules with different Makefiles. When I do
only one Makefile with

obj-m += module1
obj-m += module2

the problem dissapears.

Thanks to all.

Regards,

	Sergio
> 
> > 
> > I compile it and install without any problem.
> > 
> > And in the module I want to use them I declare list with "extern"
> > prototype:
> > 
> > extern tList list;
> > 
> > When I compile the module It says me that list is undefined, and I don't
> > know what I am doing wrong.
> 
> a compilation error or a loading error ?
> are you sure to have well defined the type tList in your "client" module ?
> may be a shareed header between your modules is missing :) 
> 
> regards
> 
> simon
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> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
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